Improvement in sawing-machines



NTTF STATES SANFORD W. NORTHROP,

'PATENT OFFICE.

OF ALBANY, NEW YORK.

IMPROVEMENT IN SAWING-MACHINES.

To all whom it may concern: K

Be it known that I, SANFORD W. Non- '1HROP,of Albany, in the coun ty of Albany and State of New York, have invented a new and useful Improvement in Sawing-Machines; and l do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specificap tion, in which- Figure l represents a plan or top view of my invention. Fig. 2 isa side elevation of the same.

Similar letters of reference in both views indicate corresponding parts.

The object of this invention is to arrange the feedrollers of a sawing machine so that they can be readily adjusted to cut a log or timber in two or more equal parts and that the feed-rollers will adjust themselves to the thickness of the log or timber.

This invention consists in binding with the feed-rollers two reciprocating slides, which are operated by double crank-shafts connected by a rod in such a manner that the feedrollers will arrange themselves automatically at such a distance from the plane of the saw as may be desired, either both at equal distances or one at a proportionally larger or smaller distance from said plane.

To enable those skilled 'in the art to make and use my invention, I will proceed to describe it.

A represents a frame, made of wood or any other suitable material, and provided with grooves which form the guides or ways for two slides, B B'. These slides support the feedrollers O, and they move backward and forward in the grooves of frame A without obstruction.

D D are two rock-shafts, which have their bearings in the sides of the frame Anear to its ends. The shaft D carries an arm, b, which is provided with a set-screw, c, that acts on the slide B, and the shaft D' carries an arm, b', with set-screw c', that acts on the slide B. The two shafts are connected by a rod, E, which is secured to a crank, d', on the shaft D' by means of a pivot, e', and to a crank, d, on the shaft D by a thumb-screw, e. The crank d is provided with two or more holes, f g, the distance of the hole f from the center of the shaft D being equal to the distance of and twice as large as the distance of the hole g from the center of the shaft D. The distance of the set-screws c o' from the centers of the shafts D D' is equal, and if they traverse the same arc the slides C B B' will be moved the same distance. If the rod E is connected to the cranks d d' at an equal distance from the centers of the shafts D D', any motionimparted to said rod will cause an equal motion of the shafts and consequently an equal motion of the slides; but, if the rod E is secured to the crank d' at a distance twice as large as that of the screw e from the center of the shafts D, any motion imparted to the rod E will cause the slide B to move twice as fast as the slide B'. The slides B B' are so adj usted, by means of the set-screws o c', that the feed-rollers are at equal distances from the plane of the saw, one pair of rollers being on either side of said plane, and if it is desired to cut a piece of timber or a log in two equal parts, the rod E is adjusted at equal distances from the centers of the shafts D D', the timber is placed between the feed-rollers, and a lever and weight is applied tothe end of the rod E in such a manner that the slides B B' are moved toward each other, and the feed-rollers are made to bear on the sides of the timber. If the timber should be tapering, the feedrollers will readily accommodate themselves to the varying thickness of the same,and the saw will divide it in two equal parts. If it should be desired to cut the timber in three equal parts, the rod E is adjusted so that the distance ofthe set-screws e from the center of the shaft D is half that of the pivot e' from the center of the shaft D', whereby any motion of the rod E is caused to impart twice as much motion to the slide B as to the slide B', and if the slides have been previously adj usted according to the thickness of the timber to be cut, said timber can be divided in three equal parts without paying any further attention to the feed-rollers. By increasing the number of holes f g in the crank d the rod E may be adjusted so that the timber is cut in more than three parts, or that it is cut up in parts of any desired proportion in relation to each other.

F is a hand-screw, which screws into a lug, IL, projecting from the inside of the frame A. By means of this hand-screw the slide B can the pivot e' from the center of the shaft D',

be disengaged from the arm b', so that a motion of the rod E, without aftectingsaid slide, causes the slide B to move toward the stationary slide B. In this case the rollers on the slide B act as an ordinary gage, and by adjusting said slide by means of the handscrewa board of any desired thickness may be cut off from a timber passing through between the feed-rollers. f

What I claim as new, and desire to secure by Letters Patent, is

l. The arrangement of the reciprocating slides B B', carrying the feed-roller C, in combination with the rock-shafts D D', arms b b', and set-screws c c', and with the rod E, connectin g the cranks d d', the whole constructed SANFORD W. NORTHROP.

Witnesses:

S. l?. WINNE, HENRY COLEMAN. 

